feat: add redis adapter

Author: kid-icarus

packages/automerge-repo-storage-redis/package.json

@@ -0,0 +1,25 @@
+{
+  "name": "@automerge/automerge-repo-storage-redis",
+  "version": "1.0.0",
+  "description": "Redis storage adapter for Automerge Repo",
+  "repository": "https://github.com/automerge/automerge-repo/tree/master/packages/automerge-repo-storage-redis",
+  "author": "Ryan Kois <[email protected]>",
+  "license": "MIT",
+  "type": "module",
+  "main": "dist/index.js",
+  "scripts": {
+    "build": "tsc",
+    "watch": "tsc -w"
+  },
+  "dependencies": {
+    "@automerge/automerge-repo": "workspace:*",
+    "debug": "^4.3.4",
+    "ioredis": "^5.3.2"
+  },
+  "publishConfig": {
+    "access": "public"
+  },
+  "devDependencies": {
+    "typescript": "^5.3.3"
+  }
+}

packages/automerge-repo-storage-redis/src/index.ts

@@ -0,0 +1,89 @@
+/**
+ * This module provides a storage adapter for Redis.
+ *
+ * @packageDocumentation
+ */
+
+import {
+  Chunk,
+  StorageAdapterInterface,
+  type StorageKey,
+} from "@automerge/automerge-repo"
+
+import { Redis, RedisOptions } from "ioredis"
+import debug from "debug"
+
+const log = debug("automerge-repo:storage-redis")
+
+export class RedisStorageAdapter implements StorageAdapterInterface {
+  private redis: Redis
+
+  /**
+   * Create a new {@link RedisStorageAdapter}.
+   * @param opts - Options to pass to the Redis client.
+   */
+  constructor(
+    opts?: RedisOptions
+  ) {
+    this.redis = new Redis(opts)
+    // TODO: handle errors
+    this.redis.on("error", (err) => {
+      log("redis error %O", err)
+    })
+  }
+
+  async load(keyArray: StorageKey): Promise<Uint8Array | undefined> {
+    const data = await this.redis.getBuffer(keyArray.join(":"))
+    return data
+  }
+
+  async save(keyArray: string[], binary: Uint8Array): Promise<void> {
+    console.log('save', binary.length, keyArray.join(":"))
+    await this.redis.set(keyArray.join(":"), Buffer.from(binary))
+  }
+
+  async remove(keyArray: string[]): Promise<void> {
+    await this.redis.del(keyArray.join(":"))
+  }
+
+  async loadRange(keyPrefix: string[]): Promise<Chunk[]> {
+    const lowerBound = [...keyPrefix, '*'].join(":")
+    const result: Chunk[] = []
+    const stream = this.redis.scanStream({
+      match: lowerBound,
+    })
+    stream.on("data", async (keys: string[]) => {
+      for (const key of keys) {
+        stream.pause()
+        const data = await this.redis.getBuffer(key)
+        result.push({
+          key: key.split(":"),
+          data,
+        })
+        stream.resume()
+      }
+    })
+    return await new Promise((resolve, reject) => {
+      stream.on("end", () => resolve(result))
+      stream.on("error", (err) => reject(err))
+    })
+  }
+
+  async removeRange(keyPrefix: string[]): Promise<void> {
+    const lowerBound = [...keyPrefix, '*'].join(":")
+    const stream = this.redis.scanStream({
+      match: lowerBound,
+    })
+    stream.on("data", async (keys: string[]) => {
+      for (const key of keys) {
+        stream.pause()
+        await this.redis.del(key)
+        stream.resume()
+      }
+    })
+    return await new Promise((resolve, reject) => {
+      stream.on("end", resolve)
+      stream.on("error", reject)
+    })
+  }
+}

packages/automerge-repo-storage-redis/tsconfig.json

@@ -0,0 +1,15 @@
+{
+  "compilerOptions": {
+    "target": "ESNext",
+    "module": "NodeNext",
+    "moduleResolution": "Node16",
+    "declaration": true,
+    "declarationMap": true,
+    "outDir": "./dist",
+    "esModuleInterop": true,
+    "forceConsistentCasingInFileNames": true,
+    "strict": false,
+    "skipLibCheck": true
+  },
+  "include": ["src/**/*.ts"]
+}

packages/automerge-repo-storage-redis/typedoc.json

@@ -0,0 +1,5 @@
+{
+  "extends": ["../../typedoc.base.json"],
+  "entryPoints": ["src/index.ts"],
+  "readme": "none"
+}